Mac OS Mail - Cannot send the message using the server Exchange - randomly appeared!

Just for no reason the message "Cannot send the message using the server Exchange" - randomly appeared! It does not affect all mails sent, but a few. I'm in a panic because I am sending a very very important mail and it's held up due to this!


Any answers will be well appreciated - I'm not deeply tech but can cope to a degree.


Many thanks friends!


Jim

Mac mini, macOS 12.7

Posted on Aug 2, 2025 08:20 AM

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Question marked as Top-ranking reply

Posted on Aug 2, 2025 08:41 AM

Remove the email accounts in use, and re-add them, and try again.


Removing the account will not affect mail on the server or mail stored locally, but it might affect mail currently stuck sending so save that message from your outbox before deleting and re-adding the accounts.

2 replies

Mac OS Mail - Cannot send the message using the server Exchange - randomly appeared!

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